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Investments (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($) Securities	Sep. 30, 2017 USD ($)	Dec. 31, 2017 Securities
Investments [Abstract]
Percentage of fixed maturity portfolio rated investment grade based on NAIC designations	97.00%		97.00%
Number of individual securities with unrealized losses | Securities	2,630		955
Percentage of unrealized losses on fixed maturity securities where securities are rated investment grade	93.00%		83.00%
Proceeds from sales of available for sale securities	$ 1,800.0	$ 496.1
Scheduled principal repayments, calls and tenders for available for sale securities	$ 997.6	$ 837.7

X

- Definition

This item represents the percentage of unrealized losses on fixed maturity securities that is on securities classified as investment grade.

+ References

No definition available.

+ Details

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X

- Definition

Represents the percentage of fixed income securities at fair value rated investment grade (NAIC 1 or 2) compared to the entire fixed income security portfolio at fair value.

+ References

No definition available.

+ Details

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X

- Definition

The total amount of proceeds received for the sale of securities, categorized neither as held-to-maturity nor trading securities, during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563

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X

- Definition

Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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X

- References

No definition available.

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- Definition

The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562

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